This is the mail archive of the
gdb@sourceware.org
mailing list for the GDB project.
Re: what is the function of EXCEPTIONS_SIGLONGJMP?
I am not trying to step over longjump, I just trace the event loop
> procedure of gdb
> so why does that exception occured?
2012/9/15 Jan Kratochvil <jan.kratochvil@redhat.com>:
> On Thu, 13 Sep 2012 11:55:34 +0200, John Smith wrote:
>> when I debug gdb using gdb self , after I type "start" command ,
>> the prompt is as below :
>> Warning:
>> Cannot insert breakpoint 0.
>> Error accessing memory address 0xdb6a5194: /.
>> 0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6
>>
>> it seem to be some exceptions happened when dealing with break points .
>
> You are trying to step over longjmp or siglongjmp call. This is supported
> only with SystemTap-extended glibc, this is implemented only in recent glibc
> and recent GDB. Recent Fedora releases also have it working.
> glibc/
> commit 8422c9a560e6e3c854739c8a13ecb1c6714f930f
> Author: Roland McGrath <roland@hack.frob.com>
> Date: Fri May 25 13:31:57 2012 -0700
> Add systemtap static probe points in setjmp/longjmp on x86.
> gdb/
> commit 014135139c612fe1fbe6f11d2350f72325a66f7c
> Author: sergiodj <sergiodj>
> Date: Fri Apr 27 20:48:52 2012 +0000
> 2012-04-27 Sergio Durigan Junior <sergiodj@redhat.com>
> Tom Tromey <tromey@redhat.com>
>
> I just do not understand how that can happen during 'start' command, 'start'
> is just doing 'tbreak' and 'run', there is no stepping involved anywhere.
>
>
> Regards,
> Jan